Newbie question: I recently upgraded Ubuntu from 10.04 to 10.10 and during the process Evolution asked me to setup my accounts from scratch. I closed the window as I thought it was an error, I restarted the computer when the upgrade was finished, and as I opened Evolution again, I found all my account settings and contacts, but stored emails were gone, together with the folders they were in.

I created the folders again with the same name, and - magic! - the mails reappeared, but as I clicked on other folders and came back, they were gone again. Any ideas how to solve the problem?

I guess the messages are still there somewhere, but Evolution can't find them. I'd like to, or at least be able to import them on Thunderbird, instead of losing them all.